In this paper

the three-dimensional Walsh sequence spectrum of digital signals of stereo image is analyzed. It is pointed out that the digital signals of stereo image can be compressed to 1/4 of the original data by stereo cross-sampling because the 3-D sequence spectrum of digital signals of stereo image concentrates on the part of 3-D low sequence. The remained and compressed 3/4 signals can be reconstructed with a 3-D lowpass overlapping digital filter In this paper the design of the 3-D lowpass overlapping sequency digital filter is described in detail and a 7×7×7 interpolated mask is also given as a example.